Joyland, a theme park in China built with massive (if unlicensed) tributes to the video games of…
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That's most likely a broken English translation, where "happiness" is meant to reflect the ride's thrill level—as in, a five-star ride has more drops, loops and other stomach-plunging features, with a one-star ride being more for the kiddies and old folks.

But it's nice to think that a theme park would try to guarantee the actual happiness you'll have there.